OJ Board

keep getting WA on this one. whats wrong??

#include<iostream>
#include<cstring>
using namespace std;

int main()
{
int i,ans,T,j;
string s;
cin>>T;

for(j=0;j<T;j++)
{
int c=0,sum=0;
cin>>s;

for(i=0;i<s.size();i++)
{
if(s[i]=='o')
s[i]=1;
if(s[i]=='x')
s[i]=0;
}

for(i=0;i<s.size ...